Manufactured Gas Plant Remediation Projects

Ever since completing our first manufactured gas plant remediation (MGP) in 2001, HIS Constructors, Inc. has been a leader in remediation at former MGP site. Since then, HIS Constructors, Inc. has successfully completed the remediation of over 35 sites across the U.S. HIS projects range from small digs and hauls to complex multi-phase projects, working directly for public utilities and environmental engineering firms. HIS has a track record of superior safety, efficiency, and productivity.


To view more of our project summaries, please click on a project category below:

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HIS Constructors, Inc. is a leader in providing environmental remediation, civil construction and industrial services.

Indiana (1/2) Project

HIS Constructors, Inc. (HIS) was contracted to perform the excavation, transportation and disposal of 20,000 tons of MGP impacted soil and debris. The project also required the stabilization of 4,000 tons of source material. Once excavation was completed, the site was backfilled and compacted with 20,000 ton imported clean fill. The site required the storage and disposal of 280,000 gallons impacted water.

Indiana (1/2) Project

Indiana (2/2) Project

HIS Constructors, Inc. (HIS) installed a temporary shoring system to protect an onsite building. The scope of excavation activities included the removal, transportation and disposal of approximately 17,000 tons of environmentally impacted soil, MGP source material and debris. The site was then backfilled and compacted with of 13,000 tons imported clean fill. Work also included working around an active storm sewer line and the removal and replacement of asphalt pavement.

Indiana (2/2) Project

South Carolina Project

HIS Constructors, Inc. (HIS) was contracted to perform the remediation of an MGP site in South Carolina. The project involved 18,600 lft. of sheet piling for an excavation area up to 40’ deep. Excavation was down to 32 feet deep. The project also involved the transportation of 19,600 tons of MGP impacted soil for thermal desorption and excavation, transportation and disposal of 19,600 tons of MGP impacted special waste soil. In addition, the on-site treatment and disposal of 900,000.00 gallons impacted water were required. Work also included the restoration of an asphalt parking lot and utility line relocation.

South Carolina Project South Carolina Project

Springfield, MO Gas & Electric Project

Site preparation activities included HIS Constructors, Inc. (HIS) constructing a 234’ x 120’ temporary fabric structure with a 46’ clear span opening at the center of the structure. HIS placed six (6) TIGG NB20 vapor-phase air purification units along the outer perimeter of the structure to assist with air purification. Other site prep performed by HIS included installation of temporary fence with fabric, erosion control, tracking pads, site clearing, well abandonment, traffic control, and continual site security measures.

HIS excavated, transported and disposed of approximately 21,000 tons of environmentally impacted soil, MGP source material and debris from within the temporary fabric structure. A temporary fabric structure was relocated to accommodate the site excavation boundaries. Excavation depths varied from 3’ to 26’ deep and included temporary shoring in portions of the site. Two (2) gas holders, a tar pit, building slab and foundations, rock, and various other structures and obstructions above and below ground were removed.

Springfield MO Gas & Electric Project Springfield MO Gas & Electric Project